If the Data Link connector (DLC) does not work, you need to find out what is causing it. It could be a blown fuse or the scan tool used was not compatible.
As to your problem, bad gas can cause misfirings and were the gas drained and replenished with new gas?
Check the spark plugs to see if any had fouled. Add some fuel booster to see if it helps.
Thursday, January 31st, 2013 AT 1:22 PM